Yes. I sometimes take care of a half Shepherd/half Collie, and when I take him to the off-leash park, he and his fellow dogs run themselves to exhaustion. I can

Yes. I sometimes take care of a half Shepherd/half Collie, and when I take him to the off-leash park, he and his fellow dogs run themselves to exhaustion. I can say this with some confidence because of the way he staggers back over to me after his romp and flops down dead at my feet.